On the front page of YouTube, for example, you can click the three dots next to any video to find a Download option there. You’ll see the option to download videos in other places, too.
You must keep YouTube open in a browser tab to keep the downloads running, but you can leave the page you’re downloading from to view other videos. Click the button, and the download will start.
When you’re using YouTube in Chrome, Edge, Firefox, or Opera and are signed into an account that has YouTube Premium, you’ll see a Download button underneath every video when you open up its full page. The only official way to download a YouTube video is to use YouTube Premium.